Three Mistakes of My Life

The probabilities that a student passes in Mathematics, Physics and Chemistry are $M$ , $P$ and $C$ respectively.
Of these subjects, the student has a 75% chance of passing in at least one, a 50% chance of passing in at least two, and a 40% chance of passing in exactly two.
Then for real values of $x$ , find the sum of all coefficients of $x$ (including the constant term) in the expansion of $(x-M)(x-P)(x-C)$ .

Assumptions and Clarifications
- The required sum must also include the constant term.